"getname()" is not always passed a pointer to packet data, so it cannot

"getname()" is not always passed a pointer to packet data, so it cannot
take responsibility for checking whether that data is present in the
packet; the callers must do so.  Having checked in a number of changes
to make the callers do so (which fixes some other potential problems as
well!), we remove the change to do the check in "getname()".